<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>v-text</title>
</head>
<body>
    <div id="app">
        <h2 v-text="message">你好</h2>
        <h2 v-text="message+'!'">你好</h2>
        <h2>{{ message+"!"}}你好</h2>
    </div>
   
</body>
</html>
 <!-- 开发环境版本，包含了有帮助的命令行警告 -->
 <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script>
    var app = new Vue({
        el:"#app",
        data:{
            message:"hello Vue.js"
        },
    })
</script>